Parchment

Cellulosic envelope surrounding the green coffee bean after depulping. The bean is kept in parchment until hulling before export. Parchment coffee handles humidity variations better.

Background & Context

Parchment (parchemin in French, parche in Spanish) is the thin, papery endocarp layer that surrounds the coffee seed inside the coffee cherry — positioned between the mucilage layer and the silver skin (spermoderm). In washed processing, depulping removes the cherry's outer skin and pulp, leaving the seed covered in mucilage and parchment; after fermentation removes the mucilage, the seed dries inside its parchment shell. Coffee in this state is called "parchment coffee", "café en parche" (Spanish), or "café en parchemin" (French). The parchment is removed in the final milling step (hulling) immediately before export, producing the smooth green bean visible in import bags. Parchment serves a protective function: it moderates moisture exchange between the seed and environment during drying and storage, and provides a buffer layer against mechanical damage during handling.

Practical Use

Parchment coffee is the standard trading and storage form at producer and cooperative level in most washed-coffee countries. For specialty buyers purchasing directly from producers or cooperatives, understanding parchment moisture content is essential: coffee stored too long in high-humidity conditions above 12% moisture is at risk of mould and mycotoxin development; too dry below 9% moisture becomes brittle, increasing physical damage during hulling. A refractometer for parchment moisture measurement is basic quality management equipment at the cooperative level. When buying parchment-stage coffee for shipment to roasting countries, buyers must account for hulling and sorting losses — typically 18–25% of parchment weight is removed as hulls, silver skin, and defective beans during milling. The parchment stage also serves as a quality sorting opportunity: before hulling, trained sorters can identify and remove beans with visible parchment abnormalities (uneven colour indicating inconsistent drying, cracked parchment indicating over-drying or mechanical damage) before they enter the green coffee pool. High-quality specialty cooperatives conduct this visual parchment inspection as a standard pre-export quality step, complementing the electronic colour sorting that occurs during wet milling.

Related Terms

Related terms: Parche, Washed process, Depulping, Mucilage, Drying.